Imagine a Trevor costing upward 3 lakh a piece, when that may not be the yearly salary of the Jawan. ?
Why not increases his salary?
To me (at least) other guns seem like Swiss watches, which costs well above 15000/- and would perform the same function that your 300/- to 1000/- watch can do , without fail.-
What Swiss watches add is the "esteem" / fashion value. Same may be for these guns.
Please understand ,I'm very much in favor of Jawans getting the best equipment for the purpose (not for any other factor). And for this a weapon has to be designed around him (a typical Indian Jawan), -like Isreal designed Merkava.
I'm sure there is ample scope of improvement in INSAS - Give INSAS it's long due attention.
.......Just my thought.......